Micrometer lock



Oct. 11, 1949. H. KERSLAKE MICROMETER LOCK Filed 'Oct. 16, 1945 Patented Oct. 11, 1949 UNITED S TAT E S QFEF ICE MIGBOMETER 'E'UCK Harry Kerslake, Ppmona,.Fla..

Application Qcfiflbfihlfi, 1945JSeria-1No; 622,541

2' Claims. 1

This invention relates to micrometers, and more particularly to locking means for micrometers.

A main object of the invention is to provide a novel and improved locking structure adapted to be readily mounted on a micrometer of the conventional type for holding the micrometer locked in position when it is desired to obtain a reading thereon.

A further object of the invention is to provide an improved locking device of very simple structure which may be readily attached to a standard micrometer and which is adapted to lock the micrometer parts in fixed relation subsequent to making a measurement therewith so that the reading of the micrometer will not be disturbed by handling of the instrument.

Further objects and advantages of the invention will appear from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is an elevational view of a conventional micrometer of the type employed to measure outside dimensions of objects, said micrometer having mounted thereon a locking device according to this invention.

Figure 2 is an elevational view of a conventional micrometer of the type employed to measure inside dimensions of objects, said micrometer being equipped with a locking device in accordance with this invention.

Figure 3 is a top plan view of the top clamping element of the locking device of Figures 1 and 2.

Figure 4 is a bottom plan View of a lower clamp element employed with the locking device of this invention.

Referring to Figure 1, ll designates a conventional micrometer of the outside dimension measuring type comprising a frame portion I2, a gauge sleeve I3 and a rotatable barrel [4, said rotatable barrel having an upper knurled portion I5. Frame I 2 is formed with a rounded end portion iii. For at times securing barrel M in fixed relation to frame l2 a clamping device I1 is provided comprising a bottom clamping member 18 adapted to engage rounded portion IE and to be locked thereto by a bolt !9. Clamping member I8 is formed with an eye portion 20 in which is rigidly secured an upwardly projecting rod 2|. Slidably engaged with rod 2| is a sleeve 22 to the upper end portion of which is rigidly secured a clamping member 23 adapted to engage knurled portion l5, said clamping member 23 being formed with an eye portion 24 in which the sleeve 22 is secured, and with a pair of lug portions 25, '25 through which passes a bolt 26 having threaded thereon a Wing nut 21 for adjusting the clamping pressure of clamping member 23 with respect to knurled portion Hi.

When a measurement is to be made, wing nut 21 is loosened sufficiently to permit rotation of barrel it with respect to frame l2 but not enough to allow sleeve 22 to become disengaged from rod 2i After the measurement is made, wing nut 21 is tightened to lock barrel M with respect to frame l2 to thereby prevent the reading of the micrometer from being disturbed by subsequent handling of the instrument.

Figure 2 illustrates the application of the locking device to an inside dimension measuring type micrometer 3! having a knurled barrel 32 which is rotatable with respect to a gauge sleeve 33. In this application or the invention the lower clamp member i8 is of a width sufficient to firmly clamp gauge sleeve 33 without obscuring the calibration markings thereon. In employing the structure of Figure 2 the procedure is the same as with the structure of Figure 1.

The locking device may be readily mounted on a standard micrometer without modifying the structure of the micrometer in any way to receive said locking device. By employing the looking device as above described errors in readings due to accidental rotation of the micrometer parts will be completely avoided.

While certain specific micrometer locking structure has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore it is intended that no limitations be placed on the invention other than as defined by the scope of the appended claims.

What is claimed is:

1. The combination with a micrometer including a gauge sleeve and a barrel rotatable on said sleeve, of a locking device detachably secured to said sleeve and barrel for holding said sleeve and barrel in a fixed relation, said device comprising a clamp member arranged transversely of said gauge sleeve and said barrel and having one end embracing a portion of said barrel, a second clamp member arranged transversely of said sleeve and said barrel and spaced from said first-named clamp member, said second clamp member having one end embracing a portion of said gauge sleeve and secured to the latter portion, a spindle disposed in spaced parallel relation with respect to said gauge sleeve and barrel and rigidly supported in the other end of said second clamping member, a sleeve carried by the other end of said firstnamed clamping member and slidably mounted on said spindle, and means extending through the embracing end of said first-named clamp member for releasing and tightening the clamping pressure of said first-named clamp member with respect to said barrel.

2. The combination with a micrometer including a gauge sleeve and a barrel rotatable on said sleeve, of a locking device detachably secured to said sleeve and barrel for holding said sleeve and 10 clamp member arranged transversely of said 15 sleeve and said barrel and spaced from said firstnamed clamp member, said second clamp member having one end embracing a portion of said gauge 7 sleeve and secured to the latter portion, a spindle disposed in spaced parallel relation with respect 20 4 l to said gauge sleeve and said barrel and having one end rigidly supported in the other end of said second clamping member and having the other end operatively connected to the other end of said first-named clamping member, and means extending through the embracing end of said firstnamed clamp member for releasing and tightening the clamping pressure of said first-named clamp member with respect to said barrel.

HARRY KERSLAKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 664,211 Clapp Dec. 18, 1900 1,269,756 Slocomb June 18, 1918 

